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A．on Friday morning
B．on Friday afternoon
C．at dusk on Friday
D．on Friday night
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A．to stop a possible comet-Earth collisionB．to knock a chunk out of the comet and see what lies underneathC．to test a newly developed missileD．to destroy the comet
A．to stop a possible comet-Earth collision
B．to knock a chunk out of the comet and see what lies underneath
C．to test a newly developed missile
D．to destroy the comet
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